Atlas Scientific EZO Pmp Pump: Error changing I2C address

Hardware
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1

Hi,

i tried to change the adress of my peristaltic pumps. I’m able to run the python code in the terminal, but then I’m not able to change the adress. I can only see the device when the pump is connected, before i run the python code.
As you can see in the following lines an “error 2” occurs.
What can I do?

pi@raspberrypi:~ $ ~/Mycodo/env/bin/python ~/Mycodo/mycodo/devices/atlas_scientific_i2c.py

>> Atlas Scientific I2C sample code
>> Any commands entered are passed to the default target device via I2C except:
  - Help
      brings up this menu
  - List
      lists the available I2C circuits.
      the --> indicates the target device that will receive individual commands
  - xxx:[command]
      sends the command to the device at I2C address xxx
      and sets future communications to that address
      Ex: "102:status" will send the command status to address 102
  - all:[command]
      sends the command to all devices
  - Poll[,x.xx]
      command continuously polls all devices
      the optional argument [,x.xx] lets you set a polling time
      where x.xx is greater than the minimum 1.50 second timeout.
      by default it will poll every 1.50 seconds
>> Pressing ctrl-c will stop the polling

>> Device at I2C address 80 has been identified as an EZO device and will be queried
>> WARNING: device at I2C address 118 has not been identified as an EZO device and will not be queried
--> module: ?I,PMP,1.04, address: 80, name: ?NAME,
>> Enter command: List_addr
--> module: ?I,PMP,1.04, address: 80, name: ?NAME,
>> Enter command: Address,80
('error', '2')

Greetings

2

You’re not issuing the command with the proper syntax, as indicated in the instructions. You can’t send a command without the address.

3

What a silly mistake. I read your hydroponic guide, but not the information on the terminal carefully.
However I tried to use the proper syntax, but it doesnt work either. Can you please help me what I’m doing wrong?

pi@raspberrypi:~ $ ~/Mycodo/env/bin/python ~/Mycodo/mycodo/devices/atlas_scientific_i2c.py

>> Atlas Scientific I2C sample code
>> Any commands entered are passed to the default target device via I2C except:
  - Help
      brings up this menu
  - List
      lists the available I2C circuits.
      the --> indicates the target device that will receive individual commands
  - xxx:[command]
      sends the command to the device at I2C address xxx
      and sets future communications to that address
      Ex: "102:status" will send the command status to address 102
  - all:[command]
      sends the command to all devices
  - Poll[,x.xx]
      command continuously polls all devices
      the optional argument [,x.xx] lets you set a polling time
      where x.xx is greater than the minimum 1.50 second timeout.
      by default it will poll every 1.50 seconds
>> Pressing ctrl-c will stop the polling

>> Device at I2C address 80 has been identified as an EZO device and will be queried
>> Device at I2C address 102 has been identified as an EZO device and will be queried
>> WARNING: device at I2C address 118 has not been identified as an EZO device and will not be queried
--> module: ?I,PMP,1.04, address: 80, name: ?NAME,
 - module: ?I,RTD,2.13, address: 102, name: ?NAME,
>> Enter command: List_addr
>> Enter command: 80:I2C,50
('error', OSError(121, 'Remote I/O error'))

>> Enter command:

Edit: I tried it again and it worked.
The Error-message confused me, but it worked.

Thank you!! :slight_smile: